类 AbstractFileResolvingResource

构造器详细资料

• AbstractFileResolvingResource

  public AbstractFileResolvingResource()

方法详细资料

• exists

  public boolean exists()

  从类复制的说明: AbstractResource
  This implementation checks whether a File can be opened, falling back to whether an InputStream can be opened. This will cover both directories and content resources.

  指定者:

  exists 在接口中 Resource

  覆盖:

  exists 在类中 AbstractResource

• isReadable

  public boolean isReadable()

  从类复制的说明: AbstractResource
  This implementation always returns true for a resource that exists (revised as of 5.1).

  指定者:

  isReadable 在接口中 Resource

  覆盖:

  isReadable 在类中 AbstractResource

  另请参阅:

  InputStreamSource.getInputStream(), Resource.exists()

• isFile

  public boolean isFile()

  从类复制的说明: AbstractResource
  This implementation always returns false.

  指定者:

  isFile 在接口中 Resource

  覆盖:

  isFile 在类中 AbstractResource

  另请参阅:

  Resource.getFile()

• getFile

  public File getFile()
               throws IOException

  This implementation returns a File reference for the underlying class path resource, provided that it refers to a file in the file system.

  指定者:

  getFile 在接口中 Resource

  覆盖:

  getFile 在类中 AbstractResource

  抛出:

  FileNotFoundException - if the resource cannot be resolved as absolute file path, i.e. if the resource is not available in a file system

  IOException - in case of general resolution/reading failures

  另请参阅:

  ResourceUtils.getFile(java.net.URL, String)

• getFileForLastModifiedCheck

  protected File getFileForLastModifiedCheck()
                                      throws IOException

  This implementation determines the underlying File (or jar file, in case of a resource in a jar/zip).

  覆盖:

  getFileForLastModifiedCheck 在类中 AbstractResource

  返回:

  the File to use for timestamp checking (never null)

  抛出:

  FileNotFoundException - if the resource cannot be resolved as an absolute file path, i.e. is not available in a file system

  IOException - in case of general resolution/reading failures

• isFile

  protected boolean isFile​(URI uri)

  This implementation returns a File reference for the given URI-identified resource, provided that it refers to a file in the file system.

  从以下版本开始:

  5.0

  另请参阅:

  getFile(URI)

• getFile

  protected File getFile​(URI uri)
                  throws IOException

  This implementation returns a File reference for the given URI-identified resource, provided that it refers to a file in the file system.

  抛出:

  IOException

  另请参阅:

  ResourceUtils.getFile(java.net.URI, String)

• readableChannel

  public ReadableByteChannel readableChannel()
                                      throws IOException

  This implementation returns a FileChannel for the given URI-identified resource, provided that it refers to a file in the file system.

  指定者:

  readableChannel 在接口中 Resource

  覆盖:

  readableChannel 在类中 AbstractResource

  返回:

  the byte channel for the underlying resource (must not be null)

  抛出:

  FileNotFoundException - if the underlying resource doesn't exist

  IOException - if the content channel could not be opened

  从以下版本开始:

  5.0

  另请参阅:

  getFile()

• contentLength

  public long contentLength()
                     throws IOException

  从类复制的说明: AbstractResource
  This method reads the entire InputStream to determine the content length.

  For a custom sub-class of InputStreamResource, we strongly recommend overriding this method with a more optimal implementation, e.g. checking File length, or possibly simply returning -1 if the stream can only be read once.

  指定者:

  contentLength 在接口中 Resource

  覆盖:

  contentLength 在类中 AbstractResource

  抛出:

  IOException - if the resource cannot be resolved (in the file system or as some other known physical resource type)

  另请参阅:

  InputStreamSource.getInputStream()

• lastModified

  public long lastModified()
                    throws IOException

  从类复制的说明: AbstractResource
  This implementation checks the timestamp of the underlying File, if available.

  指定者:

  lastModified 在接口中 Resource

  覆盖:

  lastModified 在类中 AbstractResource

  抛出:

  IOException - if the resource cannot be resolved (in the file system or as some other known physical resource type)

  另请参阅:

  AbstractResource.getFileForLastModifiedCheck()

• customizeConnection

  protected void customizeConnection​(URLConnection con)
                              throws IOException

  Customize the given URLConnection, obtained in the course of an exists(), contentLength() or lastModified() call.

  Calls ResourceUtils.useCachesIfNecessary(URLConnection) and delegates to customizeConnection(HttpURLConnection) if possible. Can be overridden in subclasses.

  参数:

  con - the URLConnection to customize

  抛出:

  IOException - if thrown from URLConnection methods

• customizeConnection

  protected void customizeConnection​(HttpURLConnection con)
                              throws IOException

  Customize the given HttpURLConnection, obtained in the course of an exists(), contentLength() or lastModified() call.

  Sets request method "HEAD" by default. Can be overridden in subclasses.

  参数:

  con - the HttpURLConnection to customize

  抛出:

  IOException - if thrown from HttpURLConnection methods